ORG 100 /Start Here
INPUT
Store X /Store 1st input value in X
INPUT
Store Y / Store 2nd input value in Y
choice, INPUT
Store C /Store choice in C
if, Load C
Subt A
Skipcond 400
Jump elseif1
JnS ADDITION /Call subroutine
Jump end
elseif1, Load C
Subt S
Skipcond 400
Jump elseif2
JnS SUBTRACT /Call subroutine
Jump end
elseif2, Load C
Subt M
Skipcond 400
Jump elseif3
JnS MULTIPLY /Call subroutine
Jump end
elseif3, Load C
Subt D
Skipcond 400
Jump elseif4
JnS DIVISION /Call subroutine
Jump end
elseif4, Load C
Subt Q
Skipcond 400
Jump choice /re-enter choice
Halt /stop the program
end, Output /Display the value
Halt /Stop
X, DEC 0
Y, DEC 0
C, DEC 0
/add two numbers
ADDITION Load X
Add Y
JumpI ADDITION / Indirect jump to return.
/subtract two numbers
SUBTRACT Load X
Subt Y
JumpI SUBTRACT / Indirect jump to return.
/multiply two numbers using continuous add loop
MULTIPLY loop, Load num
Add X
Store num
Load Y
Subt one
Store Y
Skipcond 400
Jump loop
Load num
JumpI MULTIPLY / Indirect jump to return.
/divide two numbers and return the quotient
DIVIDE If, Load X
Subt Y
Skipcond 800
Jump EndIf
Store X
Load quo
Add one
Store quo
Jump If
EndIf, Load quo
JumpI DIVIDE / Indirect jump to return.
/constants values
one, DEC 1
num, DEC 0
rem, DEC 0
quo, DEC 0
A, DEC 97 /a
M, DEC 109 /m
S, DEC 115 /s
D, DEC 100 /d
Q, DEC 113 /q
This is a calculator that is supposed to add, subtract, multiply, and divide. Once the user is done with an operand it is supposed to directly go to the next one as well, but it is giving me errors and I can't seem to fix them. Everything looks fine to me but it keeps saying "Operand undefined." I'm sure this is an obvious error to others but I can't seem to fix it. Was hoping someone can help me with this! Thanks!